"Evidence Pyramid" is a product of Tufts University and is licensed under BY-NC-SA license 4.0
Tufts' "Evidence Pyramid" is based in part on the Oxford Centre for Evidence-Based Medicine: Levels of Evidence (2009)
Check out a copy of Trisha Greenhalgh's How to Read a Paper to read about how to find a medical research paper, assess it for its scientific validity, and where relevant, put the findings into practice.